Test players, audio uploads, MIME checks and streaming — with an audible test signal instead of silence.

Can I use it commercially?

Yes. Dummy files from DummyFiles.dev are free to use in commercial projects, tests and CI. They contain no third-party copyrighted content.

How was it generated?

The MP3 is generated on download: the selected test signal, looped to the requested duration.

Set the length in the generator, up to 3600 seconds. The chosen test signal loops for that duration.

Test signals

Download dummy MP3 files: playable test audio at a chosen length, with a selectable test signal (beep, arcade, 440 Hz, 1 kHz, sweep, noise).

Go to generator

Playable dummy MP3 with an audible test signal. Pick duration and tone in the generator.

What is this file?: A playable dummy MP3 with a selectable test signal (beep, arcade, 440 Hz, 1 kHz, sweep, noise). You set the length in seconds.
How can I use it?: Test players, audio uploads, MIME checks and streaming — with an audible test signal instead of silence.
Can I use it commercially?: Yes. Dummy files from DummyFiles.dev are free to use in commercial projects, tests and CI. They contain no third-party copyrighted content.
How was it generated?: The MP3 is generated on download: the selected test signal, looped to the requested duration.
Are larger files available?: Set the length in the generator, up to 3600 seconds. The chosen test signal loops for that duration.